Out-of-bounds Read in Rtklib
CVE-2026-56788
RTKLIB through 2.4.3 contains an out-of-bounds read vulnerability in getcodepri function when processing unrecognized RINEX observation codes, allowing attackers to trigger denial of service. Crafted RINEX files with unknown observation types cause negative array indexing into the codepris table, resulting in reliable crashes and potential memory disclosure of adjacent global data.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L.
EPSS exploit prediction
EPSS: 0.002 (6.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 6th percentile — 6.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Rtklib
- Tomojitakasu Rtklib — versions 0
Weakness classification (CWE)
References
- github.com/tomojitakasu/RTKLIB/issues/797 (Exploit, technical-description, Third Party Advisory, exploit, Issue Tracking)
- www.vulncheck.com/advisories/rtklib-out-of-bounds-read-via-negative-array-index… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-56788?
- CVE-2026-56788 is a medium-severity vulnerability in Rtklib, classified under Out-of-bounds Read. CVSS score: 4.4/10. Published 2026-06-25.
- How severe is CVE-2026-56788?
- Medium severity. CVSS v3 base score is 4.4 out of 10.